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Troyanec [42]
2 years ago
7

Marcy wants to know which type of book is most commonly checked out by visitors of her local public library. She surveys people

in the children's reading room between 1:00 and 2:00 on Saturday afternoon. Which statements about Marcy's survey are true? Select all that apply. ​
Mathematics
1 answer:
kari74 [83]2 years ago
8 0

It is true about Marcy's survey that she wants to study all visitors of the library and due to this, her sample is not representative.

<h3>What does Marcy want to study?</h3>

Marcy's study focuses on determining the type of books that visitors prefer to borrow. Based on this, Marcy is studying the preferences of all the visitors to the library.

<h3>How was the sample Marcy selected?</h3>

The sample selected is not representative because she is only considering those that go to the children's room on a specific day and time of the week rather than all the visitors.

Based on this, it can be concluded her population is all visitors and the sample is not representative.

Note: This question is incomplete because the options are missing; due to this, I answered it based on general knowledge.

Learn more about population in: brainly.com/question/905400

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Using conditional probability, it is found that there is a 0.1165 = 11.65% probability that a person with the flu is a person who received a flu shot.

Conditional Probability

P(B|A) = \frac{P(A \cap B)}{P(A)}

In which

  • P(B|A) is the probability of event B happening, given that A happened.
  • P(A \cap B) is the probability of both A and B happening.
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In this problem:

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The percentages associated with getting the flu are:

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Hence:

P(A) = 0.2(0.3) + 0.65(0.7) = 0.515

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0.1165 = 11.65% probability that a person with the flu is a person who received a flu shot.

To learn more about conditional probability, you can take a look at brainly.com/question/14398287

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